I'm totally up for gunpowder weapons being added onto lotc (the primitive kind that took ten seconds or more to reload and was not very accurate) since they would add some interesting things into RP, if rp'd correctly.
there would have to be very strict rules about them, how long it takes to reload, how much you have to roll to hit, since we all know how it went when medesculors were a thing, that powergamed joke of an item.
I also don't think they should be a pvp item, the pvp is fine as is now, we don't need a reintroduction of overpowered items that ruin any track of fairness in combat, like carbarum or the magic wands, but this time a one-shot cooldown item, no thanks, no need, the pvp nations would overuse them, and people with many players could easily get their hands on one each because of how much money they make and set up a gun line and yeah you can see the problem, it would lead to so much bullshit in pvp, its fine as is, it this gets approved, keep it as a RP item only, and have strict rules for it.
Such as, no pre-loading, since that wouldn't really work with flintlock weapons anyway, the ammunition would move around inside the barell and not have any effect if you tried to fire it after a walk, and have a requirement of five or four emotes to reload, as well as you actually having to rply get your hands on one of them and have a item for it to be able to rp with them (by making one and modreqing to get a item, or buying one from someone who has it, of course there would be a limit to how many you can make and who could make them, maybe there would have to be an application on the forums like a magic app but for gunpowder weapons, something like that to regulate them, or maybe keep them as a ET thing so you get them from events or suchlike)
And as africanese said, they would throw up RP combat and culture quite a bit. currently rp combat is dominated by plate armour and longsword/polearms, just like irl late medieval times were, if a few gunpowder weapons were thrown into the mix the orcs would have some serious issues with how their warrior culture works, and the entire way of how rp combat works with armour and stuff would change, making it more interesting (if rp'd correctly)